Turbine-blade.



,992. PATENTED APR. 9 J. B.. PRIKART & 0. JAEGER.

TURBINE BLADE. APPLIGATION FILED JUNE'zz, 190e.

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UNITED STATES PATENT OEE-ICE.

TURBINE-BLADE.

Specification of Letter Patentl I Patented. April 9, 1907.

y Application filed June 22,1906. Serial No. 322,876.-

To a/ZZ whom it may concern.-

Be it known that we, J OHANN RUDOLF FRIKART, engineer, a citizen of Switzerland, and GsKAR JAEGER, engineer, a citizen of Germany, residing at Munich, Bavaria, Germany, have invented certain new and useful Improvements in Turbine-Blades and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an improved turbine-blade and means for securing the same; and its object is to provide simple and eective means for securing hollow blades of the crescent shaped cross-section type to the turbine-wheel.

The details of the invention, as hereinafter more fully described and as particularly set out in the accompanying claims, will be readily understood by reference to the accompanying drawings, in which is illustrated a preferred embodiment of the invention with modiications.

In the drawings, Figure 1 is a side elevation of a f1 agment of a wheel-rim with some blades in position. Fig. Zis a plan of Fig. 1. Fig. 3 is a cross-section on the hne 3 3 of Fig. 1. Fig. 4 is a cross-section of a modification'.

The crescent-shaped hollow blade a is preferably formed in one piece with its four-cornered foot b by pressing from a pipe or by bendin of sheet metal to give the coniiguration s own, in which the foot forms a fourcornered box-like shell with the upwardlyextending crescent-shaped blade. The rim c of the wheel is rovided at intervals with transverse slots dividing the rim of the wheel into a plurality of four-cornered sec tions of a size adapted to iit snugly within the hollow foot b. Around the two sides of the wheel-rim a circular groove eis provided, and theblade-foot b is placed over its section and the metal of the same is pressed into the groove e when the blade is in position, the latter being thus securely fastened to the rim.

In Fig. 4 a modified form of attachment is shown according to which the-wheel is provided with a circumferential groove f, the foot b of the blade being made of a size to fit withinsaid roove. In this` case .a bolt g, extendm t ough the wheel-rim and the blade, ho ds the two snugly against relative g displacement.

It will be obvious that this invention is applicable as well to radial or axial turbines and that slight modifications of the detailsv would adapt the same for a wide range of use without departing from the spirit and scope of the invention. Y

Having thus described the invention, what we claim as new, and desire tosecure by Letters Patent, is-

'1. The combination with a turbine-wheel, of blades having a tubular foot, and means for securing the foot to the rim of the wheel.`

2. The combination with a turbine-wheel, of-blades having a tubular foot arranged to embrace a portion of the wheel-rim, and

means for securing the foot to the rim of the wheel. l

3. The combination, with a turbine-Wheel,

of blades having a tubular foot arranged in telescopic relation to a portion of the Wheelrlm.

4. The combination, with a turbine-wheel,A

of blades havin V a hollow foot of angular cross-section, an means for securing the foot to the rim of the wheel.

5. The combination, with a turbine-wheel,

-of-blades having a hollow foot of angular cross-section arranged to embrace a portion of the wheel-rim, and means for securing the foot to the rim. v v

6. The combination with a turbine-wheel provided on the side of its rim with a circular groove, of blades having -a hollow foot arranged to embrace a portion of the wheel-rim and provided with an inwardly-extending crease to enga e the groove.

7. The com ination with a turbine-wheel having its rim divided into sections, of blades each having a hollow foot arranged to receive a section of the rim. n

8. The combination with a turbine-wheel having its rim divided into sections and provided on its sides with circular grooves, of

blades each having a hollow foot arranged-to receive a section of the rim the material of said foot being forced into the said grooves at the sides.

IOC

9.- The combination with a turbine-wheel having its rim divided into sections and provided on each side Witha circular groove, of crescent-shaped hollow blades each having a 5 four-cornered hollow foot arranged to receive a section of the rim, the material of the said foot being forced into the said grooves at the, f

sides.

JOHANN RUDOLF FRIKART.

BESSE/S.

OSKAR JAEGER. Witnesses z ULYssEs. J. BY WATER,

GEORG KRNER. 

